Microsoft’s App Studio beta test has been expanded to allow novice developers to build applications for Windows tablets and PCs, in addition to Windows Phone. Last year Microsoft introduced a beta version of Windows Phone App Studio in an effort to increase the number of apps for its smartphone OS by letting almost anyone build an application. The company has now expanded the platform to let users build for tablets and PCs at the same time, and renamed the service Windows App Studio, it said in a blog post on Friday.